Cerebral angiography is a diagnostic test that can help your doctor find blockages in the blood vessels of your head and neck. These blockages can lead to a stroke or aneurysm. The doctor uses a catheter—a long, flexible tube—and an ex...

Magnetic resonance imaging (MRI) of the head is a painless, noninvasive test that produces detailed images of your brain and brain stem. The test is carried out with an MRI machine, which produces the images using a magnetic field and radio waves....

A computerized tomography scan (CT or CAT scan) is a series of cross-sectional X-ray images of your body. CT scans are used to examine your bones and soft tissues for damage or abnormalities. Often, these images can be combined to create a 3D pict...

A magnetic resonance imaging (MRI) scan is a noninvasive test that uses magnets and radio waves to create images of the inside of your body. It allows doctors to see details of your organs and tissues without having to make any incisions. Accordin...

Tympanometry provides a way, along with a physical exam, for doctors to diagnose and monitor problems with the middle ear. It can help with diagnosing disorders that can lead to hearing loss, especially in children. The test measures your ear's re...